Tax calculation mostly works, I just found this instance where it doesn't:

I entered 10eb-t at the price and this is the result:

I manually entered 609 and got this:

o.O

Seems the taxed price of 10eb is impossible...

How should this be dealt with?
Leave as is or maybe choose the value below?

I think we can let it be.

Quirk of maths. Nothing we can do.